The enteric nervous system manages the gastrointestinal tract. It regulates the esophagus, stomach, small intestine, and colon by mixing food with digestive enzymes and pushing food along the tract. It also helps control the absorption of nutrients into the bloodstream and protects the body against harmful bacteria and toxins that may enter with food.
A working vagus nerve sends a steady stream of messages between the brain and the gut, with the number of messages going to the brain from the gut outnumbering those from the gut to the brain.
Through the vagus nerve, the enteric nervous system plays a major role in protecting the body from external threats.
Vegus nerve damage due to nissen fundoplication is possible as in most surgeries there is always a risk. This is a risk that can happen during surgery with even the best surgeon. I think at this point it is best to find someone extremely knowledgeable to problems like this. Good luck.
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